Ozone depletion occurs when chlorofluorocarbons, hydrofluorocarbons, and other ozone-depleting substances are released into the air. These substances often occur in refrigerants, insulating agents, solvents, pesticides, fuels, etc.
When CFCs and HCFCs get to the stratosphere, UV radiation from the sun causes the substances to break apart at a molecular level, releasing chlorine atoms that interact with ozone to start cycles of ozone destruction.
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